Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?()
A. Unique
B. Check
C. Referential
D. Informational
Ahostisexpectedtobeamailrelayorreceivingendpoint.Whichofthefollowingdaemonsshouldbelisteningforconnectionsonport25?()
A. ftpd
B. imapd
C. pop3d
D. sendmail
AnIPaddressis198.37.16.23.Whichofthefollowingrouter’sIPaddressesshouldbeusedtoroutetraffictothe193.130.56.0network?()
A. 193.130.56.0
B. 198.37.16.15
C. 198.130.16.15
D. 198.130.56.15
正式群体最大的关心是人格特性及个人差异,易于忽略成员的忠诚与否。()